Hvac unit 20 - Study guides, Class notes & Summaries

HVAC Unit 1, 2 & 3.

NHIE Practice Test Questions and Answers All Correct While inspecting the furnace you detect very high levels of carbon monoxide at the supply air registers. You should: A. Advise that everyone run out of the house for safety B. Immediately shut off the main gas valve to disable the unit C. Open windows, shut down systems, and advise immediate evaluation by an HVAC contractor D. Explain that the unit will need servicing in the future to prolong its life - Answer- C. Open windows, shut do...

0-20 DB Sound Level - Loudness: Very Faint Source: Whisper (5) 100-200 DB Sound Level - Loudness: Deafening Source: Generator (5) 20-40 DB Sound Level - Loudness: Faint Source: Quiet Conversation (5) 4 Primary Project Delivery Methods - - Design Bid Build - Design Build - CMAR - Multiple Prime Contracts (2) 4 Types of Shifting - Settlement, Upheaval, Sliding, Liquefaction. (4) 40-60 DB Sound Level - Loudness: Moderate Source: Average Conversation (5) 60-80 DB Sound Level - Loudness:...

HVAC UNIT 20 EXAM STUDY GUIDE WITH ALL ANSWERS UPDATED.

What is the best method to repair a fractional horsepower motor that has a bad bearing? Replace the entire motor. A technician needs to check a single-phase compressor. He labels the three terminals "A," "B," and "C" and takes resistance readings of the windings. He reads 10 ohms from "A" to "B," infinity from "B" to "C," and infinity from "C" to "A." Identify the terminals. Can not identify terminals: open winding Technician "A" says that a shorted winding wi...

Unit 20 Troubleshooting Electric Motors / HVAC Unit 20 Review Questions and Review Test

Unit 1: Read This Unit First: What I Need to Know to Understand Electricity Unit 2: Ohms Law Unit 3: Safe Use of Electrical Instruments Unit 4: Electrical Fasteners Unit 5: Power Distribution Unit 6: National Electric Code Unit 7: Electrical Installation of HVAC Unit 8: Transformers Unit 9: Relays, Contactors and Motor Starters Unit 10: Capacitors Unit 11: Thermostats Unit 12: Pressure Switches Unit 13: Miscellaneous Electrical Components Unit 14: How Do Mo...

HVAC Unit 1, 2 & 3

The inspector is not required to determine ____ ___ of any system or component. - Answer- -Years of age -Life expectancy -Make model Horizontal waste pipe should slope ____ inch per foot - Answer- 1/4" per foot if < 3 inch pipe. 1/8" per foot if > or = to 3 inch pipe Drip screed - Answer- Also called weep screed. Used at the base/bottom of stucco walls to release moisture. Pressure Vacuum Breaker (PVB) - Answer- Used for Backflow Prevention. Lawn Irrigation systems: install...

2 wires in nipple - ANSWER31% 20 amp Branch circuit supplies multiple receptacles the receptacles shall have a ampere rating no less than - ANSWER15 amps 24' nipple fill - ANSWER60% 30' nipple - ANSWER53% 42' nipple - ANSWER53% a 120 volt 15-20 amp receptacle shall be located with in of air conditioning and refrigeration, heating systems - ANSWER25 feet a door used by personnel to exit the work space that is less than 25 feet from the work space shall - ANSWERswing out...